Renewable fuse



F. c. LA MAR 1,788,770

RENEWABLE FUSE Filed March 23, 1928 I I 1 1a againstthe end of Patented Jan. 13, 1931 TESPATENT orries F ANKcQLAMAR, or 1 IEw' YoR-K,,N.Y;, ASSIGNOR To Gniaa'r WESTERN FUSE ooiu- PANY, or rrrrseunen, PENNSYLVANIA, A CORPORATION or DELAWARE RENEWABLE ruse Application flled' llarch 23,

The object which I have in view isthe. provision of a new and improved renewable fuse of substantial yet inexpensive construction, which may be readily assembled, and disassembled by unskilled persons and with-. out the use of specialitools, and which will be sealed against the escape of flame from the fuse body along the terminal blades.

In the accompanying drawings, wherein I have illustrated the best embodiment of the principles of my invention now known tfzo me, Fig. 1 is a longitudinal section of the use.

Fig. 2 is an end view of the same, looking from the left in Fig. 1 and with the screw cap omitted.

Fig. 3 is a plan View of the sealing disk.

Fig. 4 is an outer face View ofthe slotted washer. I 7 V Fig. 5 is an inner face view of the same.

Fig. 6 is a side elevation of one of the terminal blades, the left one in Fig. 1.

Fig. '7 is an inner end view of the same.

Fig. 8 is an end view of one of the ferrules.

Referring to the drawings, 1 represents the tubularshell of the fuse made of suitable insulating material, such as fibre; I

On each end of the shell 1 a metal ferrule 2 is fixed, as by threaded engagement and riveting.

The outer ends of the ferrules are provided with recesses which form the seats 3. I prefer to provide two of such seats in each ferrule and dispose them diametrically of the ferrule as shown in'Fig. 8.

The shell and the ferrules comprise the tubular body of the fuse.

4 and 5 indicate the two metal terminal blades whose inner ends are reduced and have detachably connected thereto the ends of the fusible link 6. a 7

One of said terminal blades, the right hand one 4 in Fig. 1, has fixedly mountedthereon the circular closure head '7 which bears the corresponding ferrule 2 andis provided on its inner face with a 1 diametrically disposed rib 8 whose endsengage the seats 3 and thus prevent relative rotation between the closure head and the body of the fuse. I

portion of less diameterihaving arcuate notches 11.

192s. Serial No. 264,139.

An annularcap '9 sorews on the end of the IQIIHlG and clamps the. head '7 snugly in place on the ferrule.

The other blade 5 isprovided with a laterally extending abutment. 10 extending on either-side thereof and adjacent to the outer side ofsaid abutment with two opposed pnotches 11 in its side edges which form a :restricted neck 111 the blade.

' lVhen the parts are assembled the abut-- iIlQllb'lO lies slightly within the outer end a of the corresponding ferrule 2.

12 indicates-a slotted washer which' is slipped down over the blade 5 against the end of the ferrule and is provided with. a walls 131which fit into the end of the ferrule. The

slotted washer bears against the abutment 10.

At either si'de 'the slotted washei' is proyided on its under side witha lug "14 which engages the corresponding seat '3 in the end of the ferrule to prevent: relative rotation between the washer and the body of the fuse. I i y 15 indicates a sealing. disk which is cut away inwardly from one .sidezto form a rectangular aperture 16 of'sufficient width to span the neck After the slotted Washer has been placed in 'POS1tlO11',thfi sealing disk 1s slid across of the-blade 5 betweenthe the face of the washer with the side eeges of its aperture 16 engaging under the outer shoulders or walls of'the notches 11 inthe. blade. and the lnner face of the disk bearing on the washer." i y i r Thus the ends of the slot. in the washer 12 are sealed from without by the'disk 15' while (the sides of the slot are sealed from within by the abutment 10 ofthe blade.

The disk is circularand of substantially the samediameter as the washer, so that when the disk is in its sealing position the perimetral edges of the washer and disk are in substantial registration. l

The washer is provided with fixed filler block 17 on its outer face on the opposite side of the. blade from the side from which the sealing disk. is. slid into position, which block body,

disk and the filler block and thus holding the parts fixedly to the body of the fuse.

In assembling the fuse, the terminal blades are attached to the ends of the. fusible link and the terminal blade 5 and the link are inserted through the right end of the body in Fig. 1 until the closure head 7 seats on the end of the body. The corresponding cap 9 is then screwed in place.

The slotted washer is then slipped down over the blade 5 against the abutment 1.0 and engaging the seats 3 in the ferrule. The sealing disk is then slipped into position and the corresponding cap 9 is then screwed onto the end of the body.

When the parts are to he disassembled, the right hand screw cap, in Fig. 1, is first removed and then the left hand cap and the sealing disk and slotted washer. The terminals are thus released.

It is evident that the assemblage and disassemblage of my improved fuse may be quickly and conveniently accomplished.

It is further evident that the slot of the washeris sealed at its sides by the abutment on the blade and at its ends by the sealing disk. Thus the passage of flames outwardly along the blade is prevented.

The fuse is simple, contains few parts and therefore inexpensive to manufacture. What I desire to claim is 1. In a renewable fuse, the combination of a tubular body, a terminal blade arranged to extend through the end of the body and provided with a lateral abutment and with shoulders adjacent the outer side of said abutment, a slipped down over the end of the blade and rest on said abutment and the end of the said washer and body having interengaging portions which prevent relative rotation between the parts, a sealing disk having an open aperture with parallel sides forming a pair of le s and arranged to be slid over the face of the washer, the legs of said disk straddling the blade and engaging the shouldered portions thereof to hold the washer against the abutment, portions of the disk and the washer interengaging to prevent relative rotation of the disk and washer, and an annular cap screwed onto the end of the body and having an inwardly extending flange which engages the sealing disk and clamps it and the washer fixedly to the body.

2. In a renewable fuse, the combination of a tubular body, a terminal blade arranged to extend through the end of the body and provided with a lateral abutment and with shoulders adjacent the outer side of said slotted washer arranged to be,

abutment, a slotted washer arranged to be slipped down over the end of the blade and rest on said abutment and the end of the body, said washer and body having interengaging portions which prevent relative rotation between the parts, a one-piece sealing disk having a central open aperture and arranged to he slid over the face of said washer and to straddle the blade and engage the shouldered portions of said blade to hold said washer against said abutment, an annular cap screwed onto the end of the body and clamping the sealing disk and washer fixedly thereto, and the washer being provided with a filler block which is straddled by the sealing disk and engaged thereby to prevent relative movement between the disk and the washer.

York, N. Y., this 19th day Signed at New of March, 1928.

' FRANK C. LA MAR.

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